本文選題：生物炭基復(fù)合材料　切入點(diǎn)：吸附　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鄰苯二甲酸酯(PAEs)和四環(huán)素類抗生素(TCs)是兩種典型的有機(jī)污染物,在土壤中有相當(dāng)高濃度的殘留,迫切需要有效的污染治理和控制技術(shù)。生物炭(BC)具有較高的比表面積、發(fā)達(dá)的孔隙結(jié)構(gòu)和豐富的表面官能團(tuán),可以通過改變土壤理化性質(zhì)增強(qiáng)土壤對(duì)有機(jī)污染物的吸附和固定能力,減輕有機(jī)污染物對(duì)土壤的生態(tài)毒性。在控制和治理土壤有機(jī)污染方面具有廣闊的應(yīng)用前景。本文主要以玉米秸稈為生物炭原料,用化學(xué)方法對(duì)其改性制備出生物炭-納米二氧化錳復(fù)合體(BMnc)和生物炭-納米氧化鋅復(fù)合體(BZnc),然后采用批量平衡法對(duì)其吸附鄰苯二甲酸二丁酯(DBP)和土霉素(OTC)的性能和機(jī)制進(jìn)行研究。在此基礎(chǔ)上,探討了生物炭基復(fù)合材料對(duì)棕壤吸附和固定DBP和OTC的影響。主要研究結(jié)果如下:(1)BMnc材料中MnO2納米片團(tuán)聚成球狀結(jié)構(gòu),XPS分析表明Mn的氧化態(tài)為Mn(Ⅳ)。BZnc材料中,梭形的氧化鋅納米棒均勻地分散在BC的表面,XPS分析表明Zn的化合態(tài)包含ZnO和Zn(OH)2兩種組分。(2)負(fù)載MnO2和ZnO均能提高BC對(duì)DBP和OTC的吸附能力,且MnO2和ZnO的負(fù)載量是影響吸附性能的重要因素。實(shí)驗(yàn)結(jié)果表明,BC和MnO2質(zhì)量比為20:1和10:1的BMnc分別對(duì)DBP和OTC的吸附效果最好,而BC和ZnO質(zhì)量比為20:1的BZnc對(duì)兩種物質(zhì)表現(xiàn)出更強(qiáng)的吸附能力。(3)BC、BMnc和BZnc吸附DBP及OTC的動(dòng)力學(xué)曲線符合準(zhǔn)二級(jí)動(dòng)力學(xué)模型,表明吸附過程主要受化學(xué)反應(yīng)控制。Langmuir等溫吸附模型和Freundlich等溫吸附模型均能很好地對(duì)等溫吸附數(shù)據(jù)進(jìn)行擬合,表明吸附過程包含物理吸附和化學(xué)吸附。吸附作用力主要包括范德華力、氫鍵、π-π EDA作用和化學(xué)反應(yīng)等。(4)BMnc和BZnc均能提高棕壤對(duì)DBP和OTC的吸附和固定能力。實(shí)驗(yàn)結(jié)果表明,棕壤中DBP和OTC的吸附容量隨BMnc或BZnc的添加量增加而增大。綜合來看,BMnc對(duì)棕壤的改良效果好于BZnc,對(duì)于修復(fù)PAEs和TCs污染的土壤有很好的應(yīng)用前景。(5)隨著pH增加,土壤對(duì)DBP和OTC的吸附容量減小。這可能是土壤與DBP和OTC分子間的靜電引力增大引起的。
[Abstract]:Phthalate PAEsand tetracycline antibiotics (TCs) are two typical organic pollutants, which have a high concentration of residues in soil, and are in urgent need of effective pollution treatment and control techniques. BCC has a high specific surface area. The developed pore structure and abundant surface functional groups can enhance the adsorption and fixation of organic pollutants by changing the physical and chemical properties of the soil. It has broad application prospect in controlling and controlling soil organic pollution. In this paper, corn straw is mainly used as biochar material. The biocarbonium-nanometer manganese dioxide complex (BMnc) and the biocarbon-nanometer zinc oxide complex (BZncC) were prepared by chemical method. Then the adsorption properties of dibutyl phthalate (DBP) and oxytetracycline (oxytetracycline) were studied by batch equilibrium method. And mechanisms. On this basis, The effect of biocarbonitic composites on adsorption and immobilization of DBP and OTC in brown soil was studied. The main results are as follows: (1) MnO2 nanoplates agglomerate into spherical structure in BMnc. The results show that the oxidized state of mn is mn (鈪，

本文編號(hào)：1617012